Naval service: Zhemchug 11/8/1941
was torpedoed by German submarineU451 at Cape
Kanin Nos. Brilliant 12/5/1942 was sunk by German aircraft at Iokanga;
raised 25/9/1942, repaired and in June, 1944 commissioned again; 23/9/1944 she
was sunk by German submarine U957 in Kara Sea.

Rubin and Sapfir after war were returned to
Board Guard, but in March, 1955 transferred to the Navy and 31/5/1955 renamed Kushum and Vizim
respectively. They were stricken in 1959-1960.